For most Chrysler 300 models, you either use a traditional keyed ignition or a keyless push-button start. If your car has a physical key, insert it into the ignition and turn to Start. If your model uses a key fob with a Start button, keep the fob inside the vehicle, press the brake, and press Start. This guide covers both scenarios and common pitfalls.
Identify which starting system your vehicle uses
Chrysler 300s built in recent years may use a traditional ignition cylinder or a keyless system with a Start button. Look for a visible key slot vs. a Start/Stop button. If a key fob is required, ensure the fob is inside the cabin and, for push-button start, that the brake pedal is pressed when starting. If you’re unsure, consult the owner’s manual or check the VIN with a dealer to confirm the ignition type for your exact trim and year.
Traditional keyed ignition
If your Chrysler 300 has a conventional ignition cylinder, follow these steps to start the car using the metal key.
Before you begin, make sure the transmission is in Park (P) and the parking brake is engaged. Then proceed with the steps below:
- Insert the metal key into the ignition cylinder.
- Turn the key to the Start position and hold briefly until the engine catches; then release the key to the Run position as soon as the engine starts.
- Allow the engine to settle into idle and confirm gauges show normal operation before driving away.
- If the engine does not start after a few seconds, release the key, wait a moment, and try again. Refrain from cranking continuously for more than a few seconds at a time.
- If repeated attempts fail, check the 12-volt battery, fuses, and fuel level, or seek assistance from a qualified technician.
Starting with a traditional key is straightforward when the ignition cylinder is functioning and the vehicle is in Park with the parking brake on. If the ignition won’t turn or the engine won’t catch, there may be a mechanical or electrical issue requiring professional service.
Keyless/Push-Button Start
Many Chrysler 300 models use a keyless system with a Start button. The “key” in this case is your key fob, which must be inside the vehicle. The following steps outline the standard process.
Before starting, ensure the key fob is inside the vehicle and the brake pedal is pressed. Then use the Start button as described below:
- Press the brake pedal firmly with your foot while the vehicle is in Park (P).
- Press the Start/Stop button once to start the engine. The instrument cluster should illuminate and the engine should begin running.
- If the engine does not start, check that the fob battery isn’t dead, move the fob closer to the Start button area, and verify the car remains in Park. Some models require the fob to be detected before starting.
- If the fob battery is dead, you may need to use a backup method described in your manual, such as a nearby key slot or a separate emergency start procedure, or replace the fob battery and try again.
Keyless start is designed for convenience, but it hinges on the fob’s detection inside the vehicle and the brake being engaged. If the Start button doesn’t respond, the fob battery or sensor could be at fault, or the car may require service.
Troubleshooting common starting issues
When a Chrysler 300 doesn’t start as expected, several common issues could be at fault. Here are the typical culprits and quick checks you can perform.
Before you read through potential causes, review this short list of common reasons a Chrysler 300 might fail to start, so you know what to check first:
- Weak or discharged 12-volt battery
- Dead or weak key fob battery (for keyless start)
- Ignition switch or contact failure
- Transmission not fully in Park
- Brake pedal sensor or wiring fault
In many cases, a quick battery check or replacing the key fob battery resolves the issue. If problems persist, you may need professional diagnostics to assess electrical systems, the immobilizer, or the ignition hardware.
Summary
Starting a Chrysler 300 depends on your ignition type. With a traditional key, insert and turn the key in the ignition cylinder while the car is in Park and the parking brake engaged. With a keyless Start, keep the fob inside, press the brake, and push the Start button. If starting problems arise, inspect the battery (vehicle and fob), ensure the gear is in Park, and consider professional service if the issue continues. Knowing your system and having fresh batteries on hand can prevent most starting hiccups.